DE10305917B4 - Chill roll with a substantially hollow interior - Google Patents

Abstract

Cooling roller having a substantially hollow interior (50), which is flowed through by a cooling medium, and in the interior (50) of the cooling roller (14) located mixing element (32) for mixing the cooling medium, wherein the cooling roller (14) relative to the Rotating mixing element, characterized in that the distance of the mixing element (32, 36) from the inner jacket surface (20) of the cooling roller (14) is variable.

Description

The present invention relates to a cooling roll having a substantially hollow interior according to the preamble of claim 1 and to a method for cooling a material web according to the preamble of claim 10.

In web-fed rotary printing, for example in web-fed rotary offset printing, a web of material is unwound from a roll in a roll changer, vertically or horizontally fed for printing through a plurality of successively arranged printing units, then passed through a hot air dryer for drying and finally for cooling the web of material heated in the hot air dryer over cooling rolls passed a chill roll stand. Subsequently, the web can be cut into a folder to signatures and folded, it being possible to subsequently supply them to a distribution system. Usually, the web is printed by the printing units on both sides and multi-color, the use of dampening solution is necessary in conventional offset printing, which is why the web before further processing, for example, in the folder, first dried and then cooled.

Prior art chill roll stands typically include a plurality of chill rolls flushed by a cooling medium, the material web being guided on a meandering path through the chill roll stand and around the chill rolls. In this case, the material web contacts the surfaces of the cooling rolls in what are known as looping sections, in which heat is transferred from the heated material web to the cooled cooling roll surface.

In order to dissipate the heat transferred to the cooling roll of the web, the cooling roll is flushed or flowed through by a cooling medium, for example by cooled water, wherein the coolant flow can be effected by individual cooling rolls, by parallel or serially connected cooling rolls.

From the JP-07-17021 a chill roll is already known, which is mounted with its two end portions in a respective side wall and which is flushed by a coolant, which is on at an end portion of the chill roll and discharged again. The cooling roll has in its interior a feeding element for the cooling medium, from which the cooling medium is directed in the radial direction to an angular portion of the inner surface of the cooling roll shell and entrained by the rotation of the cooling roll. By another located in the cooling roller interior element, the entrained cooling medium is deflected and passed into a discharge channel formed by the feed element, from which it can flow out of the cooling roller and back to a reservoir.

Furthermore, from the DE-OS 21 21 899 a heat exchange roller is known, which is flowed through in the axial direction of a cooling medium and which has in the interior of the cooling roll shell in the axial direction of successively arranged deflecting elements, which serve for mixing the coolant flow in the cooling roll. The baffles are fixedly connected to the cooling roller body and rotate together with this.

Furthermore, from the DE-OS 15 61 118 a cooling cylinder has become known which has a fixedly mounted scoop in its interior, which rotates together with the cylinder body and scoops the cylinder supplied cooling medium in the direction of the cylinder pin and thus drives out of the cooling roller.

The EP 0 943 435 A1 further describes a chill roll having in its interior an axially disposed chamber through which the cooling medium flows from one end portion of the chill roll to the other end portion of the chill roll and is mixed in the chambers, respectively. The partitions of the individual chambers are fixedly connected to the cooling roller and perform together with this a rotational movement.

Due to the ever-increasing demands on the one hand with regard to printing speed and further processing, and on the other hand with regard to the print quality in the area of web-fed rotary printing, the problem often arises with conventional cooling units, for example chill roll stands with rotating chill rolls, that their cooling capacity is no longer sufficient at higher processing speeds, which makes it the further processing can lead to defects in the printed products or damage to the printing press.

However, even at low processing speeds, the cooling performance may become unsatisfactory due to the lack of sufficient mixing of the cooling medium, d. H. the heated web leaves the chill roll stand at a temperature which is higher than a desired or required for post-processing temperature.

If the cooling performance of a chill roll stand no longer meets the given requirements, the ink on the web, which is sticky due to the heat of the chill roller upstream dryer, for example a hot air dryer, no longer sufficiently cooled and thereby solidified. This can lead to unfavorable deposition of ink on the cooling roller surfaces or even on turning bars of a folder superstructure. Furthermore, bonded signatures can lead to a product jam in a folder and thus to serious damage to the machine. It is an object of the present invention to provide a chill roll with which the aforementioned disadvantages of the prior art can be overcome.

It is a further object of the present invention to provide a cooling roll which ensures a required heat transfer from the material web to the cooling roll or to a cooling medium in the interior of the cooling roll even at different processing speeds.

It is a further object of the present invention to provide a method of cooling a web of material by which the aforementioned disadvantages of the prior art can be overcome.

It is a further object of the present invention to provide a method which provides optimum heat transfer from a web to a chill roll or to a cooling medium inside the chill roll, even at different processing speeds, i. H. for example, at both low and high processing speeds.

These objects are achieved by the features of claim 1 and 10. Further features of the invention are contained in the dependent subclaims.

A cooling roller according to the invention with a substantially hollow interior, through which a cooling medium flows, is characterized by a mixing element located in the interior of the cooling roller for mixing the cooling medium, wherein the cooling roller rotates relative to the mixing element.

According to the invention, the cooling roller rotates relative to the mixing element, which advantageously leads to a significantly increased mixing of the cooling medium at all operating speeds.

A chill roll according to the invention advantageously ensures a desired heat transfer from the material web to be processed, for example a paper web, to the chill roll jacket and further to the cooling medium, for example water, both at low and moderate processing speeds and at high processing speeds.

It may further be provided in an advantageous manner that the cooling roller is rotatably mounted in a side wall, for example, a chill roll stand, and that the mixing element is rotatably mounted on the side wall.

The rotationally fixed arrangement of the mixing element on the side wall leads advantageously to the relative movement according to the invention between the mixing element and the cooling roll shell, which leads to the desired mixing of the cooling medium and thus to an improved heat absorption by the cooling medium on the inner jacket surface of the cooling roll. Furthermore, it is advantageous to arrange the mixing element rotationally fixed to the side wall, as this can be dispensed with a separate drive for the mixing element.

In a further embodiment of the invention, the mixing element may be formed as at least one mixing blade, which extends in particular substantially over the width of the interior of the cooling roller. It can also be provided that the mixing element has at least one mixing blade. The mixing blade may have at least one opening. The mixing element may preferably be formed as a strip or as a tube or as a sieve.

The designed as a mixing blade or at least one mixing blade having mixing element ensures advantageously the desired mixing of the cooling medium within the cooling roller body. Also, the choice of the length of the mixing element according to substantially the extent of the interior of the cooling roller advantageously supports optimal mixing of the cooling medium. Furthermore, an additional increase in the mixing effect of the mixing blade can be achieved by the formation of openings in the mixing blade, wherein the flow resistance of the mixing element is reduced in an advantageous manner.

In addition, it can also be provided that at least a part of the mixing element is arranged close, in particular closer than 10 mm or closer than 5 mm, to an inner jacket surface of the cooling roll.

The provision of a small distance between the mixing element and the inner jacket surface of the chill roll, for example in the range between 10 mm and 1 mm, advantageously ensures a desired mixture of the cooling medium, especially at low operating speeds. For example, the distance may be any even millimeter between 10mm and 1mm, including these limits. The distance can also be, for example, a portion of the Range between 10 mm and 1 mm, including these limits form, with z. For example, any even millimeter value between 10 mm and 1 mm may be an upper or lower partial range limit.

Preferably, in a further embodiment of the invention, the distance of the mixing element from the inner circumferential surface of the cooling roller can be changed.

Due to the possibility of deliberately changing the distance, for example by means of a control and / or by means of a regulation, the degree of mixing of the cooling medium and thus the heat transfer property of the cooling roll as a whole can advantageously be considered as operating conditions of the machine and / or the product or product to be processed whose material is adapted.

Furthermore, it can also be provided that the mixing element is acted on by a spring force, such that the mixing element assumes different positions, in particular different angular positions or deflections, at different rotational speeds of the cooling roller.

However, it can also be provided that the mixing element under the action of gravity at different rotational speeds of the cooling roller different positions, in particular different angular positions or deflections occupies.

The mixing element provides a resistance to the flow of the cooling medium in the interior of the cooling roll, which causes turbulence or the formation of vortices and thus mixing of the cooling medium. By applying the mixing element with a spring force or by the action of gravity on the mixing element, the force acting on the mixing element by the flow of a variable counteracting force is opposed, so that in particular at different rotational speeds of the cooling roller, the mixing element different positions, in particular different angular positions or deflections, can take. Both the spring force and the effective component of the gravitational force have different sizes at different angular positions or deflections of the mixing element, so that advantageously the flow of the cooling medium with increasing flow velocity and thus with increasing angular position or deflection of the mixing element is also an increasing opposing force.

In addition, the mixing element may also be adjustable from the outside, for example to adjust the above-mentioned distance. For example, it may be provided to move and / or position the mixing element in the radial direction with respect to the chill roll axis by means of an adjustment drive, for example a motor or a known variable transmission. It is also possible to provide the mixing element with at least one movable section, which can be positioned via a known adjusting from the outside.

It can further be provided that the mixing element is arranged on a central supply element, in particular on a pipe, through which the cooling medium is guided into the interior of the cooling roller.

Thus, it is possible to dispense with an additional fastening unit for the mixing element and, instead, an already existing supply element for supplying the cooling medium can be advantageously used.

In a further embodiment of the invention can be provided that the central supply element is guided at a first end portion of the cooling roller through a first journal of the cooling roller and at least one outlet for the cooling medium in the vicinity of a second end portion of the cooling roller. In addition, it can also be provided that the central supply element is rotatably mounted on a second end portion of the cooling roller. Furthermore, it can be provided that the first end section of the cooling roller, in particular the first bearing journal, has an opening for discharging the cooling medium. The supply element may further distributed over its length and having spaced outflow openings for the cooling medium.

In a further embodiment of the invention, the cooling medium may flow through the cooling roll from a first end portion of the cooling roll to a second end portion of the cooling roll.

It can be provided that the interior of the cooling roller is substantially space-filling flows through the cooling medium, d. H. that the cooling medium flows through the cooling roller substantially over its entire cross section.

Further, in the spirit of the invention, the chill roll may further comprise a cylindrical surface and two journals rotatably mounted in opposite sidewalls, for example, chill roll or drying roll sidewalls, at least one journal having a passageway for attachment of the mixing element to a sidewall can.

Furthermore, a supply line for the cooling medium, for example water, may be provided, which is connected both to an end section of the cooling roller, in particular to a bearing journal of the cooling roller, and to a temperature control unit and / or to a coolant reservoir. The journal can be in operative connection with a rotary feedthrough.

It can also be advantageously provided to form the cooling roller as a driven roller, in particular to provide a drive which drives the cooling roller directly or via at least one further cooling roller or a gear, for example a gear transmission or toothed belt transmission.

By using a drive for the cooling roller according to the invention can be ensured in an advantageous manner that the cooling roller rotates at a rotational speed necessary for web transport, even if an increased rotational resistance is generated by the mixing element located in the interior of the cooling roller.

In a further embodiment of the invention, an outer surface of the cooling roller for transferring an oil-containing and / or aqueous and / or silicone-containing substance, for example a dampening solution or a silicone oil emulsion, on a material web, in particular a paper web, may be provided.

It is also within the meaning of the invention advantageous to provide a cooling roller with an elastically configured or flexible mixing element, such that the mixing element assumes different curved contours at different rotational speeds of the cooling roller. It is also possible for a plurality of such mixing elements to be arranged adjacent to one another in the axial direction, wherein these may be arranged in different angular positions on a base element.

Furthermore, a chill roll stand, in particular a chill roll stand which is directly downstream of a dryer or integrated into a dryer, can be characterized by at least one chill roll according to the invention as described above.

Furthermore, a dryer, in particular a hot-air dryer and / or a floating dryer, may be characterized by at least one cooling roll according to the invention as described above and / or by an integrated cooling roll stand according to the invention as described above.

Furthermore, a printing press, in particular a web-fed rotary printing press or a web-fed rotary offset printing press, can be characterized by such a cooling roll according to the invention and / or such a cooling roll stand according to the invention and / or such a dryer according to the invention as described above.

An inventive method for cooling a material web, in particular a paper web, with a cooling roller having a substantially hollow interior, characterized by the step of mixing a cooling medium flow with a mixing element, which is located in the interior of the cooling roller, wherein the cooling roller relative to the mixing element rotates, off.

When using the method according to the invention, an optimal mixing of the cooling medium can be achieved in an advantageous manner and thus the desired cooling of the material web at all operating speeds can be ensured.

Further, a method of the invention may include generating swirls or swirls in the coolant stream.

In continuation of the inventive concept, a method for cooling a material web may further comprise changing the distance of the mixing element from an inner circumferential surface of the cooling roller. In this case, agents may be used, as described above with respect to a cooling roller according to the invention.

As a result, the mixing of the cooling medium in the interior of the cooling roller, for example controlled and / or regulated, can be adapted to the external operating conditions, such as processing speed or paper type and thickness, which in any case provides a desired and / or required cooling the material web is reached.

Furthermore, it can be provided that the method comprises a substantially space-filling flow through the interior of the cooling roller with the cooling medium.

In addition, the method according to the invention may preferably also provide for driving, in particular direct driving, of the cooling roller, for example by means of a drive.

The invention will be described below with reference to the drawings based on preferred embodiments. In the drawings, corresponding features are provided with the same reference numerals.

In the drawings show:

1 a schematic side view of a web-fed rotary printing machine with vertical web guide;

2a a schematic longitudinal sectional view of a cooling roller according to the invention;

2 B a schematic longitudinal sectional view of another cooling roller according to the invention;

2c a schematic longitudinal sectional view of another cooling roller according to the invention;

3a a schematic cross-sectional view of a cooling roller according to the invention;

3b a schematic cross-sectional view of another cooling roller according to the invention with a movable mixing element;

3c a schematic cross-sectional view of another cooling roller according to the invention with fountain solution;

3d a schematic cross-sectional view of another cooling roll according to the invention with flexible mixing elements;

3e a schematic cross-sectional view of the cooling roller according to the invention with flexible mixing elements at a higher rotational speed.

In 1 is a web-fed rotary printing machine 1 shown in which a material web 2 is processed by the material web 2 initially through four printing units 4a - 4d led and printed by these two-sided four-color and in the printed state a hot air dryer 6 with a dryer section 6a and one in the hot air dryer 6 integrated chill roll stand 6b is supplied. The material web 2 is in the dryer section 6a of nozzle arrangement 8th floating and heated hot air applied and in a transition area 10 the chill roll stand 6b supplied, in which the material web 2 a variety of cooling rollers 12 partially wraps around. The material web 2 passes through the chill roll stand 6b a meandering path, which preferably extends predominantly in the vertical direction, and may after leaving the chill roll stand 6b a further processing device, for example a folding apparatus, are supplied.

At least one chill roll 14 the variety of cooling rollers 12 the chill roll stand 6b is embodied according to the invention and will be illustrated in more detail in the following drawings and described in more detail with reference to these drawings.

In 2a is the chill roll 14 shown in a schematic longitudinal sectional view and has both a first end portion 16 , or a first journal 16 , as well as a second end section 18 , or a second journal 18 on, which by a cylinder coat 20 are connected. The chill roll 14 is with its first end portion in a first rolling bearing 22 a first side wall 24 and with its second end portion 18 in a second rolling bearing 26 a second side wall 28 rotatably received. For driving the cooling roller 14 is a drive 30 , which with the second end portion 18 the cooling roller is drivingly connected, provided. The drive 30 can be a motor, for example, an electric motor, which is the cooling roller 14 directly or via a toothed belt or a chain drives. However, it is also possible that the drive 13 is realized in the form of a transmission, via which the cooling roller 14 is driven by a motor, not shown.

Inside the chill roll is a mixing element 32 arranged, which has a Zuführabschnitt 34 for the cooling medium, for example a tubular element, and a mixing blade 36 includes. The feeding section 34 is on the first side wall 24 rotatably, that is secured against rotation, arranged and the mixing blades 36 is again at the feed section 34 arranged. The first end section 16 the chill roll 14 has an implementation 38 for the feeding section 34 on while the second end section 18 the chill roll 14 a rolling bearing 40 comprises, in which the feed section 34 is received rotatably. Carrying out the feeding section 34 through the first end section 16 and the rotatable bearing of the feed section 34 in the second end portion 18 the chill roll 14 allows a relative rotational movement of the cooling roller body of the cooling roller 14 with respect to the mixing element 32 , which, due to the arrangement on the first side wall 24 , does not rotate. The chill roll 14 , or their roll shell 20 can thus perform a rotational movement about the mixing element.

The mixing wing 36 has at least one opening 42 on, can flow through the cooling medium.

The supply of the cooling medium takes place from a reservoir 44 via a supply line 46 and through the hollow interior 48 the feed section formed as a tube into the substantially hollow interior 50 the chill roll 14 , wherein the cooling medium from at least one opening 52 of the feed section 34 of the mixing element 32 exit. The drainage of the cooling medium is carried out by the execution 38 in the first end section 16 the chill roll 14 and a discharge line 54 , wherein the discharge line 54 also to the reservoir 44 can be returned. The reservoir 44 includes cooling medium, for example water, which is supplied by a cooling device 56 for example via a heat exchanger 58 is cooled.

In 2 B is a schematic longitudinal sectional view of another cooling roll according to the invention 14 shown, wherein the second end portion 18 the chill roll 14 an implementation 60 for the cooling medium, so that the cooling medium on the implementation 38 in the first end section 16 the chill roll 14 the interior 50 fed and from there through the implementation 60 in the second end section 18 the chill roll 14 can be derived. By this removal of the cooling roller 14 the flow through the cooling roller body with the cooling medium from the first end portion to the second end portion. The mixing element 32 has a base element 62 which is on the first side wall 24 is rotationally fixed and through the implementation 38 of the first end section 16 the chill roll 14 is guided and in a rolling bearing 40 in the second end section 18 the chill roll 14 is received rotatably. Furthermore, the mixing element 32 one on the base element 62 arranged mixing blades 36 for generating swirls or swirls in the cooling medium flow during the rotation of the cooling roll 14 on. Also in 2 B shown cooling roll 14 can by a drive 30 be rotated directly or indirectly. Although in 2 B not shown, can also be the cooling roller shown there 14 with a reservoir 44 and a cooling device 56 keep in touch.

In 2c is a schematic longitudinal sectional view of another cooling roll according to the invention 14 shown, wherein the second end portion 18 the chill roll 14 an implementation 60 for the cooling medium, so that the cooling medium on the implementation 38 in the first end section 16 the chill roll 14 the interior 50 fed and from there through the implementation 60 in the second end section 18 the chill roll 14 comparable to the one in 2 B shown embodiment can be derived. By this construction, the cooling roller 14 the flow through the cooling roller body with the cooling medium from the first end portion to the second end portion. The mixing element 32 has a base element 62 which is on the first side wall 24 is rotationally fixed and through the implementation 38 of the first end section 16 the chill roll 14 is guided and in a rolling bearing 40 in the second end section 18 the chill roll 14 is received rotatably. Furthermore, the mixing element 32 several on the base element 62 arranged mixing blades 36 for generating swirls or swirls in the cooling medium flow during the rotation of the cooling roll 14 on. In the 2c shown cooling roll 14 can by a drive 30 be rotated directly or indirectly. Although in 2c not shown, can also be the cooling roller shown there 14 with a reservoir 44 and a cooling device 56 keep in touch. The mixing blades 36 are on the base element 62 , z. As a rod or pipe, arranged alternately in different angular positions. The embodiment shown here comprises mixing blades 36 , which alternately in a 0 ° position or a 180 ° position on the base member 62 are arranged or attached. However, it also other angular positions, angular relationships or angular sequences, eg. B. in 120 ° - or 90 ° steps, conceivable. A detailed description of the mixing blades 36 is related to 3d ,

In the 2a . 2 B and 2c shown embodiments of the invention are particularly applicable to cooling rollers with a small diameter, for example, a diameter of less than 30 mm and preferably have a separate drive.

In 3a is a schematic cross-sectional view IIIa-IIIa, which is the 2a can be taken. The chill roll 14 has a chill roll shell 20 on which is a substantially hollow interior 50 encloses. Concentric with the chill roll shell 20 is the feeding section 34 of the mixing element 32 arranged on which the mixing blades 36 is attached. By the rotation of the cylinder jacket 20 this will be the chill roll 14 flowing cooling medium entrained in the direction of rotation and through the mixing blade 36 swirled, causing a mixing of the cooling medium and improved heat transfer from the chill roll shell 20 on the cooling medium in the interior 50 comes.

It is further 3a to see that the mixing blades 36 close to the inner surface of the chill roll shell 20 protrudes, with the distance 64 of the mixer 36 from the inside of the cylinder jacket 20 preferably less than 10 mm or less than 5 mm is selected.

In 3b is a schematic cross-sectional view of another embodiment of the invention shown, wherein at the feed section 34 a movable mixing blade 36 with a fixing section 66 and a moving section 68 is arranged. By the rotation of the cooling roll shell 20 represented by the direction of rotation arrow 78 , the cooling medium inside the chill roll 14 also rotated, the movable section 68 of the mixer 36 increasingly deflected with increasing rotational speed and thereby at different rotational speeds, that is, operating speeds of the printing press, has different or self-adaptive resistance properties.

The moving section 68 of the mixer 36 can be acted upon by a spring force or oppose a different force under the influence of gravity of the flow of the cooling medium in different deflections.

3c shows a further embodiment of the invention in a schematic cross-sectional view, wherein the cooling roller 14 from a material web 2 in a wrap area 70 is entwined. The surface of the chill roll shell 20 stands with an applicator roll 74 connected to a sink 76 dips. In the tub 76 is a dampening solution or a silicone oil emulsion stored, which via the applicator roll 34 on the surface 72 of the cooling roll shell 20 is brought and from there to the Rückbefeuchtung in the dryer 6 dried material web on one side of the web 2 is applied. The chill roll 14 has a fixed mixing blade 36 but may also be similar to a movable or deflectable mixing blade 3b be equipped.

In the 3d and 3e is a schematic cross-sectional view IIId-IIId, which is the 2c can be taken. The chill roll 14 has a chill roll shell 20 on which is a substantially hollow interior 50 encloses. Concentric with the chill roll shell 20 that is the basic element 62 of the mixing element 32 arranged, on which the mixing blades 36 are attached. By the rotation of the cylinder jacket 20 this will be the chill roll 14 flowing cooling medium in the direction of rotation 78 swept along and through the mixing wing 36 swirled, causing a mixing of the cooling medium and improved heat transfer from the chill roll shell 20 on the cooling medium in the interior 50 comes.

As in 3d shown at low rotational speeds, the mixing blades 36 only a slight curvature on. As further out 3b recognizable, are the mixing blades 36 at higher rotational speeds due to the force imparted by the entrained cooling medium on the surfaces of the mixing blades 36 correspondingly more bent, which increases the distance 64 the respective tip of a mixing blade from the inner wall of the cooling roll shell 20 changed. This also changes the effect of the mixing elements 36 in terms of mixing.

LIST OF REFERENCE NUMBERS

1

Rotary press

2

web

4a-4d

printing units

6

Hot air dryer

6a

dryer section

6b

Chill stand

8th

nozzle assembly

10

Transition area

12

Variety of cooling rollers

14

chill roll

16

first end section

18

second end section

20

cylinder surface

22

first rolling bearing

24

first sidewall

26

second rolling bearing

28

second side wall

30

drive

32

mixing element

34

feeding

36

mixing blades

38

execution

40

roller bearing

42

opening

44

reservoir

46

feed

48

Interior of feed section

50

Interior of the chill roller

52

opening

54

discharge

56

cooling device

58

heat exchangers

60

execution

62

base element

64

distance

66

attachment section

68

moving section

70

wrap region

72

surface

74

applicator roll

76

tub

78

direction of rotation

Claims (10)

Chill roll with a substantially hollow interior ( 50 ), which is traversed by a cooling medium, and one in the interior ( 50 ) of the chill roll ( 14 ) mixing element ( 32 ) for mixing the cooling medium, wherein the cooling roller ( 14 ) is rotated relative to the mixing element, characterized in that the distance of the mixing element ( 32 . 36 ) from the inner mantle surface ( 20 ) of the chill roll ( 14 ) is changeable. Chill roll according to claim 1, characterized in that the chill roll ( 14 ) rotatable in a side wall ( 24 ) is stored and that the Mixing element ( 32 ) rotatably on the side wall ( 24 ) is arranged. Chill roll according to at least one of the preceding claims, characterized in that the mixing element ( 32 ) as at least one mixing blade ( 36 ), which extends substantially over the width of the interior ( 50 ) of the chill roll ( 14 ). Chill roll according to at least one of the preceding claims, characterized in that at least a part of the mixing element ( 32 ) closer, namely closer than 10 mm or closer than 5 mm, to an inner mantle surface ( 20 ) of the chill roll ( 14 ) is arranged. Chill roll according to one of claims 1 to 4, characterized in that the mixing element ( 32 . 36 . 66 . 68 ) is acted upon by a spring force, such that the mixing element ( 32 . 36 . 66 . 68 ) at different rotational speeds of the cooling roller ( 14 ) assumes different positions, namely different angular positions. Chill roll according to one of claims 1 to 4, characterized in that the mixing element ( 32 . 36 . 66 . 68 ) under the action of gravity at different rotational speeds of the cooling roller ( 14 ) assumes different positions, namely different angular positions. Chill roll according to at least one of the preceding claims, characterized in that the chill roll ( 14 ) is designed as a driven roller, namely a drive ( 30 ), which the cooling roller ( 14 ) directly or via at least one further cooling roller or via a gear, namely a gear transmission or a toothed belt drive, drives. Chill roll according to one of claims 1 to 7, characterized in that the mixing element ( 32 . 36 ) is designed elastically, such that the mixing element ( 32 . 36 ) at different rotational speeds of the cooling roller ( 14 ) assumes various curved contours. Printing machine, namely web-fed rotary printing press or web-fed rotary offset printing press, characterized by a cooling roll according to one of claims 1 to 8. Method for cooling a material web ( 2 ), in particular a paper web, with a cooling roller ( 14 ), which has a substantially hollow interior ( 50 ), characterized by the method steps: - mixing a cooling medium flow with a mixing element ( 32 ), which in the interior ( 50 ) of the chill roll ( 14 ), wherein the cooling roll ( 14 ) relative to the mixing element ( 32 ), and - changing the distance of the mixing element ( 32 . 36 . 66 . 68 ) from an inner mantle surface ( 20 ) of the chill roll ( 14 ).

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